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iio: adc: adi-axi-adc: add oversampling

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Add support for enabling/disabling oversampling.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-8-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Antoniu Miclaus
2025-02-14 15:19:53 +02:00
committed by Jonathan Cameron
parent 7a794e3a0d
commit 208a94c888
1 changed files with 24 additions and 0 deletions
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24
drivers/iio/adc/adi-axi-adc.c
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@@ -47,6 +47,7 @@
#define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1)
#define ADI_AXI_ADC_REG_CNTRL_3 0x004c
#define AXI_AD485X_CNTRL_3_OS_EN_MSK BIT(2)
#define AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK GENMASK(1, 0)
#define AXI_AD485X_PACKET_FORMAT_20BIT 0x0
#define AXI_AD485X_PACKET_FORMAT_24BIT 0x1
@@ -379,6 +380,28 @@ static int axi_adc_ad485x_data_size_set(struct iio_backend *back,
FIELD_PREP(AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK, val));
}
static int axi_adc_ad485x_oversampling_ratio_set(struct iio_backend *back,
unsigned int ratio)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
/* The current state of the function enables or disables the
* oversampling in REG_CNTRL_3 register. A ratio equal to 1 implies no
* oversampling, while a value greater than 1 implies oversampling being
* enabled.
*/
switch (ratio) {
case 0:
return -EINVAL;
case 1:
return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
AXI_AD485X_CNTRL_3_OS_EN_MSK);
default:
return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
AXI_AD485X_CNTRL_3_OS_EN_MSK);
}
}
static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
struct iio_dev *indio_dev)
{
@@ -548,6 +571,7 @@ static const struct iio_backend_ops adi_ad485x_ops = {
.chan_status = axi_adc_chan_status,
.interface_type_get = axi_adc_interface_type_get,
.data_size_set = axi_adc_ad485x_data_size_set,
.oversampling_ratio_set = axi_adc_ad485x_oversampling_ratio_set,
.debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
.debugfs_print_chan_status =
iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),